I think with the right amount of gear that Guardian is just really strong regardless of stat distribution. With enough stamina and armor from gear we can just use Ironfur regardless of stats and survive. I've been using DPS trinkets till recently cause I didn;t have anything better, and now I have some survival trinkets and I'm seriously considering going back, cause there's really nothing that threatens me so much that I need the trinkets. I'd rather just add the extra DPS.
I'd look for Versa/Mastery gear when you can get it for your tank set, but I wouldn't worry too much about it if you are doing the content you want to do anyway without it.
With the 7.1.5 patch they'll look at secondary stats again and how they compare to eachother and primary stats, so it's also worth keeping an eye on PTR datamining and notes to see if anything changes for Guardian in this regard. Things might change (though I doubt crit would ever come out as our best survival stat).